Abstract: A bioimpedance device for surgical cavities has pick-up electrodes surrounded by driving electrodes, each driving electrode having greater area than the pick-up electrodes, the electrode array coupled through an adjacent connector to an electronics module. The electronics module fits through laparoscopic ports. The electronics module includes a voltage controlled current source, multiplexing for driving electrodes, a force sensor, and voltage buffers, and couples to a data acquisition system coupled to a processor. The processor uses the apparatus to perform bioimpedance mapping of tissue.